Secure Transmission in STAR-RIS-Assisted Cell-Free Networks: Maximizing Weighted Sum Secrecy Rate

被引：1
作者：
Wang, Yawen [1 ]
Fan, Jiancun [1 ]
Luo, Jie [1 ]
Yu, Sheng [1 ]
Zhang, Jinbo [2 ]
机构：
[1] Jiaotong Univ, Sch Informat & Commun Engn, Xian 710049, Shaanxi, Peoples R China
[2] CETC, 54th Res Inst, Sci & Technol Commun Networks Lab, Shijiazhuang 050081, Peoples R China
来源：
IEEE COMMUNICATIONS LETTERS | 2024年 / 28卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Security; Reflection; Array signal processing; Wireless communication; Reconfigurable intelligent surfaces; Optimization; Fans; STAR-RIS; cell-free network; physical layer security;
D O I：
10.1109/LCOMM.2024.3416529
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
This letter focuses on the secure transmission problem in simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted cell-free networks. Previous research has primarily focused on optimizing the transmission and reflection coefficients of STAR-RIS independently. However, we take into account the practical coupled phase shift characteristics of STAR-RIS. We design a secure beamforming scheme by combining the distributed base station of the cell-free network, aiming to maximize the weighted sum secrecy rate (WSSR). To solve the highly non-convex problem, we employ the Augmented Lagrangian (AL) method by linearizing the original problem, enabling us to obtain a closed-form solution for the coupled phase shift of STAR-RIS in each iteration. The simulation results show that compared with the traditional RIS-assisted cell-free system, the proposed scheme has significantly improved security performance.
引用
收藏
页码：2001 / 2005
页数：5
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